As soon as I feel the first symptoms I immediately start with the zinc therapy. I have tried different varieties but I tend to prefer the spray. Several sprays over the tongue, tonsils, roof of mouth every 2 or 3 hours, do not drink for about 15 mins after, and no OJ or citrus foods for 30 mins before or after. Should shorten the length and severity of the cold.
I'm prone to catching just about everything so I just keep a small bottle of the spray in my backpack at all times during cold season.
The spicy food thing is probably true as spicy food is known to stimulate your immune system. Other than that, plenty of liquids. water or your favorite tea. Avoid overly caffeinated stuff if possible (i go with green tea, very mild caffeine. or herbal tea), and also avoid dairy.